User:Deepak.n.sonukumar

Why Galvanization is better than tin Coating?

Galvanization means coating with Zinc.The Zinc coating ,being less noble than Iron tends to corrode selectively. Corrosion Of This Coating Leaves behind electrons, which concentrate in the iron making it cathodic and hence it becomes inert from corrosion.

But coating of iron with other metals which are low reactive than iron like Tin, saves iron only up to the time, they are present on the iron. And Even On minute Exposure( Even A Small Scratch) of Iron to moist atmosphere initiates corrosion. This is due the fact that iron is more reactive than tin, so on exposure to atmosphere, electrons start flowing from iron to tin making iron more anodic and now tin actively promotes corrosion of the iron!